Insulator



FIG. 1 is a perspective view of the insulator of the present design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view as seen from the left hand side of FIG. 2;

FIG. 4 is a side elevational view as seen from the right hand side of FIG. 2;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for an insulator, as shown and described. 